Fig. 2.

Changes in mean probability of one-year mortality (with 95% confidence intervals), reflecting patient severity of illness. Probabilities are calculated by logistic regression analysis, adjusting for age, Glasgow Coma Scale score, significant comorbidity, pre-admission functional status and the modified Simplified Acute Physiology Score II. The y-axis scale extends from 0 to 0.4, where 0 indicates that the probability is 0% and 0.4 that the probability is 40%. Severity of illness decreased markedly from 2007 to 2009, where after it remained largely the same